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Long‐term Changes in Littoral Habitats and Communities in Lake Mikolajskie (Poland)
Author(s) -
Pieczyńska Ewa,
Ozimek Teresa,
Rybak Jan Igor
Publication year - 1988
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19880730402
Subject(s) - littoral zone , phragmites , macrophyte , biomass (ecology) , sewage , ecology , habitat , environmental science , algae , shore , invertebrate , range (aeronautics) , aquatic plant , natural (archaeology) , biology , geography , wetland , fishery , environmental engineering , paleontology , materials science , composite material
Lake Mikolajskie is seriously affected by Mikolajki town and tourism. The amount of sewage entering the littoral zone is increasing as also is the area of the artificially transformed shore. During the past 20 years the area occupied by macrophytes has decreased markedly. The decline of Phragmites australis , changes in species composition, and reductions in biomass and in the depth‐range colonized by submerged plants have been observed. Simultaneously the biomass of algae has increased markedly. Animals characteristic of polluted sites have become more abundant. Changes in animal numbers result to a great extent from changes in the availability of natural substrates. Zonation of the occurrence of organisms has been observed for years on sites directly affected by sewage—quantitatively and qualitatively poor communities are found at sewage discharge points and the richer ones at a greater distance in the zone fertilized by diluted sewage.